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Operating Instructions - Section 30
Page 30-16
TOWING
Before towing a truck, many factors must be
carefully considered. Serious personal injury
and/or significant property damage may result if
important safety practices, procedures and
preparation for moving heavy equipment are not
observed.
A disabled machine may be towed after the following
precautions have been taken.
• Do not tow the truck any faster than 8 kph (5
mph).
• Tow with a solid tow bar. DO NOT tow with a
cable. Use a towing device with ample strength
for the weight of this truck.
• Never tow a truck on a slope.
• Inspect towing components, such as tow bars
and couplings, for any signs of damage. Never
use damaged or worn components to tow a
disabled vehicle.
• Keep a safe distance from the trucks and towing
apparatus while towing a vehicle.
• When connecting a truck that is to be towed, do
not allow anyone to go between the tow vehicle
and the disabled vehicle.
• Set the coupling of the truck being towed in a
straight line with the towing portion of the tow
truck, and secure it in position.
• An operator is to remain in the cab of the towed
vehicle at all times during the towing procedure.
Special Wiring Harness
Before towing, a special wiring harness must be
made in order to release the parking brake. The har-
ness will require approximately 9 meters (30 ft) of
#14 wire, and one ON/OFF switch (capable of carry-
ing 2 amps of current) and two ring terminals. Using
a ring terminal, one end of the wire must connect to a
24VDC bus bar (1, Figure 30-1) in the auxiliary con-
trol cabinet to supply 24V to the solenoid. Switch (2)
must be positioned in the harness so the operator
can operate the switch while seated in the operators
seat. The harness must be fitted with a connector (4)
to allow it to be plugged into parking brake solenoid
(3) inside the brake cabinet. Wire (5) leading from
this connector is to be connected to the ground block
using a ring terminal. Refer to Figure 3-7 for an over-
view of the special wiring harness when installed on
the truck.
The parts required to connect to the solenoid are:
• one housing (PB8538)
• two sockets (08191-05430)
• one wedge (PB8540)
1. Shut the engine off.
2. Block the wheels on the disabled truck to
prevent movement while preparing the truck for
towing and while attaching the tow bar.
3. Ensure the towing vehicle has adequate
capacity to both move and stop the towed truck
under all conditions.
4. Ensure that the tow bar has adequate strength
(approximately 1.5 times the empty vehicle
weight of truck being towed). Install tow bar
between the two vehicles.
5. If necessary, install quick disconnect fittings to
the bleeddown manifold to allow the hydraulic
system to be operational. Install hydraulic
connections for steering/braking between the
tow vehicle the and disabled vehicle. An
auxiliary power unit can also be used.
6. After the hydraulic connections are made,
check the disabled vehicle braking and steering
systems for normal operation.
7. If the truck is loaded, dump the entire load.
Never pull or tow a loaded truck. Refer to
"Disabled Truck Dumping Procedure".
8/11 OM3062
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